Comment by Kney

Anyone knows if Tyrannical sets will be sold again?

Comment by fientje

Wowhead lists some of the items for this set as 'no longer available in the game'.Last patch, 6.0.2 however, several vendors were added to Serpent's Spine (alliance).These npc's seem to sell all pvp sets from the latest expansion, including these set pieces.

I assume, but cannot confirm that the pandaria pvp vendors for horde also sell these now.